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          分布式锁
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        <p>[TOC]</p>
<h1 id="如何使用锁解决超卖问题？"><a href="#如何使用锁解决超卖问题？" class="headerlink" title="如何使用锁解决超卖问题？"></a>如何使用锁解决超卖问题？</h1><span id="more"></span>

<p><img src="https://gitee.com/littlefxc/oss/raw/master/images/QQ20210429-123340@2x.png" alt="image-20210429123322683"></p>
<p><img src="https://gitee.com/littlefxc/oss/raw/master/images/image-20210429123825952.png" alt="image-20210429123825952"></p>
<p><img src="https://gitee.com/littlefxc/oss/raw/master/images/QQ20210429-123959@2x-20210429124034459.png" alt="image-20210429123948747"></p>
<p><img src="https://gitee.com/littlefxc/oss/raw/master/images/QQ20210429-124118@2x.png"></p>
<p><img src="https://gitee.com/littlefxc/oss/raw/master/images/%E8%B6%85%E5%8D%96%E7%8E%B0%E8%B1%A1%E8%A7%A3%E5%86%B3_update.png" alt="image-20210429124223611"></p>
<p> <img src="https://gitee.com/littlefxc/oss/raw/master/images/QQ20210506-230803@2x.png" alt="image-20210506230736162"></p>
<p><img src="https://gitee.com/littlefxc/oss/raw/master/images/QQ20210506-230955@2x.png"></p>
<p><img src="https://gitee.com/littlefxc/oss/raw/master/images/QQ20210506-231732@2x.png"></p>
<p><img src="https://gitee.com/littlefxc/oss/raw/master/images/QQ20210506-231848@2x.png"></p>
<p><img src="https://gitee.com/littlefxc/oss/raw/master/images/QQ20210507-214536@2x.png" alt="image-20210507214519527"></p>
<p>示例如下所示：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Service</span></span><br><span class="line"><span class="meta">@Slf4j</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">OrderService</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Resource</span></span><br><span class="line">    <span class="keyword">private</span> OrderMapper orderMapper;</span><br><span class="line">    <span class="meta">@Resource</span></span><br><span class="line">    <span class="keyword">private</span> OrderItemMapper orderItemMapper;</span><br><span class="line">    <span class="meta">@Resource</span></span><br><span class="line">    <span class="keyword">private</span> ProductMapper productMapper;</span><br><span class="line">    <span class="comment">//购买商品id</span></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">int</span> purchaseProductId = <span class="number">100100</span>;</span><br><span class="line">    <span class="comment">//购买商品数量</span></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">int</span> purchaseProductNum = <span class="number">1</span>;</span><br><span class="line">    <span class="meta">@Autowired</span></span><br><span class="line">    <span class="keyword">private</span> PlatformTransactionManager platformTransactionManager;</span><br><span class="line">    <span class="meta">@Autowired</span></span><br><span class="line">    <span class="keyword">private</span> TransactionDefinition transactionDefinition;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> Lock lock = <span class="keyword">new</span> ReentrantLock();</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">//    @Transactional(rollbackFor = Exception.class)</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> Integer <span class="title">createOrder</span><span class="params">()</span> <span class="keyword">throws</span> Exception</span>&#123;</span><br><span class="line">        Product product = <span class="keyword">null</span>;</span><br><span class="line"></span><br><span class="line">        lock.lock();</span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            TransactionStatus transaction1 = platformTransactionManager.getTransaction(transactionDefinition);</span><br><span class="line">            product = productMapper.selectByPrimaryKey(purchaseProductId);</span><br><span class="line">            <span class="keyword">if</span> (product==<span class="keyword">null</span>)&#123;</span><br><span class="line">                platformTransactionManager.rollback(transaction1);</span><br><span class="line">                <span class="keyword">throw</span> <span class="keyword">new</span> Exception(<span class="string">&quot;购买商品：&quot;</span>+purchaseProductId+<span class="string">&quot;不存在&quot;</span>);</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">            <span class="comment">//商品当前库存</span></span><br><span class="line">            Integer currentCount = product.getCount();</span><br><span class="line">            System.out.println(Thread.currentThread().getName()+<span class="string">&quot;库存数：&quot;</span>+currentCount);</span><br><span class="line">            <span class="comment">//校验库存</span></span><br><span class="line">            <span class="keyword">if</span> (purchaseProductNum &gt; currentCount)&#123;</span><br><span class="line">                platformTransactionManager.rollback(transaction1);</span><br><span class="line">                <span class="keyword">throw</span></span><br><span class="line">                        <span class="keyword">new</span> Exception(<span class="string">&quot;商品&quot;</span>+purchaseProductId+<span class="string">&quot;仅剩&quot;</span>+currentCount+<span class="string">&quot;件，无法购买&quot;</span>);</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">            productMapper.updateProductCount(purchaseProductNum,<span class="string">&quot;xxx&quot;</span>,<span class="keyword">new</span> Date(),product.getId());</span><br><span class="line">            platformTransactionManager.commit(transaction1);</span><br><span class="line">        &#125;<span class="keyword">finally</span> &#123;</span><br><span class="line">            lock.unlock();</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        TransactionStatus transaction = platformTransactionManager.getTransaction(transactionDefinition);</span><br><span class="line">        Order order = <span class="keyword">new</span> Order();</span><br><span class="line">        order.setOrderAmount(product.getPrice().multiply(<span class="keyword">new</span> BigDecimal(purchaseProductNum)));</span><br><span class="line">        order.setOrderStatus(<span class="number">1</span>);<span class="comment">//待处理</span></span><br><span class="line">        order.setReceiverName(<span class="string">&quot;xxx&quot;</span>);</span><br><span class="line">        order.setReceiverMobile(<span class="string">&quot;13311112222&quot;</span>);</span><br><span class="line">        order.setCreateTime(<span class="keyword">new</span> Date());</span><br><span class="line">        order.setCreateUser(<span class="string">&quot;xxx&quot;</span>);</span><br><span class="line">        order.setUpdateTime(<span class="keyword">new</span> Date());</span><br><span class="line">        order.setUpdateUser(<span class="string">&quot;xxx&quot;</span>);</span><br><span class="line">        orderMapper.insertSelective(order);</span><br><span class="line"></span><br><span class="line">        OrderItem orderItem = <span class="keyword">new</span> OrderItem();</span><br><span class="line">        orderItem.setOrderId(order.getId());</span><br><span class="line">        orderItem.setProductId(product.getId());</span><br><span class="line">        orderItem.setPurchasePrice(product.getPrice());</span><br><span class="line">        orderItem.setPurchaseNum(purchaseProductNum);</span><br><span class="line">        orderItem.setCreateUser(<span class="string">&quot;xxx&quot;</span>);</span><br><span class="line">        orderItem.setCreateTime(<span class="keyword">new</span> Date());</span><br><span class="line">        orderItem.setUpdateTime(<span class="keyword">new</span> Date());</span><br><span class="line">        orderItem.setUpdateUser(<span class="string">&quot;xxx&quot;</span>);</span><br><span class="line">        orderItemMapper.insertSelective(orderItem);</span><br><span class="line">        platformTransactionManager.commit(transaction);</span><br><span class="line">        <span class="keyword">return</span> order.getId();</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>

<p><img src="https://gitee.com/littlefxc/oss/raw/master/images/QQ20210507-221236@2x.png"></p>
<p><img src="https://gitee.com/littlefxc/oss/raw/master/images/%E5%9F%BA%E4%BA%8E%E6%95%B0%E6%8D%AE%E5%BA%93%E7%9A%84%E5%88%86%E5%B8%83%E5%BC%8F%E9%94%81.png" alt="QQ20210507-223258@2x"></p>

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